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linux/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c

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powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
/*
* LocalPlus Bus FIFO driver for the Freescale MPC52xx.
*
* Copyright (C) 2009 Secret Lab Technologies Ltd.
*
* This file is released under the GPLv2
*
* Todo:
* - Add support for multiple requests to be queued.
*/
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/spinlock.h>
powerpc: Fix up modules that should be including module.h So that we can clean up the header files and not be relying on implicit includes from device.h ---> module.h Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-05-27 13:23:32 -04:00
#include <linux/module.h>
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/mpc52xx.h>
#include <asm/time.h>
powerpc, dma: move bestcomm driver from arch/powerpc/sysdev to drivers/dma The bestcomm dma hardware, and some of its users like the FEC ethernet component, is used in different FreeScale parts, including non-powerpc parts like the ColdFire MCF547x & MCF548x families. Don't keep the driver hidden in arch/powerpc where it is inaccessible for other arches. .c files are moved to drivers/dma/bestcomm, while .h files are moved to include/linux/fsl/bestcomm. Makefiles, Kconfigs and #include directives are updated for the new file locations. Tested by recompiling for MPC5200 with all bestcomm users enabled. Signed-off-by: Philippe De Muyter <phdm@macqel.be> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2012-10-12 17:52:45 +02:00
#include <linux/fsl/bestcomm/bestcomm.h>
#include <linux/fsl/bestcomm/bestcomm_priv.h>
#include <linux/fsl/bestcomm/gen_bd.h>
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_DESCRIPTION("MPC5200 LocalPlus FIFO device driver");
MODULE_LICENSE("GPL");
#define LPBFIFO_REG_PACKET_SIZE (0x00)
#define LPBFIFO_REG_START_ADDRESS (0x04)
#define LPBFIFO_REG_CONTROL (0x08)
#define LPBFIFO_REG_ENABLE (0x0C)
#define LPBFIFO_REG_BYTES_DONE_STATUS (0x14)
#define LPBFIFO_REG_FIFO_DATA (0x40)
#define LPBFIFO_REG_FIFO_STATUS (0x44)
#define LPBFIFO_REG_FIFO_CONTROL (0x48)
#define LPBFIFO_REG_FIFO_ALARM (0x4C)
struct mpc52xx_lpbfifo {
struct device *dev;
phys_addr_t regs_phys;
void __iomem *regs;
int irq;
spinlock_t lock;
struct bcom_task *bcom_tx_task;
struct bcom_task *bcom_rx_task;
struct bcom_task *bcom_cur_task;
/* Current state data */
struct mpc52xx_lpbfifo_request *req;
int dma_irqs_enabled;
};
/* The MPC5200 has only one fifo, so only need one instance structure */
static struct mpc52xx_lpbfifo lpbfifo;
/**
Fix common misspellings Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-30 22:57:33 -03:00
* mpc52xx_lpbfifo_kick - Trigger the next block of data to be transferred
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
*/
static void mpc52xx_lpbfifo_kick(struct mpc52xx_lpbfifo_request *req)
{
size_t transfer_size = req->size - req->pos;
struct bcom_bd *bd;
void __iomem *reg;
u32 *data;
int i;
int bit_fields;
int dma = !(req->flags & MPC52XX_LPBFIFO_FLAG_NO_DMA);
int write = req->flags & MPC52XX_LPBFIFO_FLAG_WRITE;
int poll_dma = req->flags & MPC52XX_LPBFIFO_FLAG_POLL_DMA;
/* Set and clear the reset bits; is good practice in User Manual */
out_be32(lpbfifo.regs + LPBFIFO_REG_ENABLE, 0x01010000);
/* set master enable bit */
out_be32(lpbfifo.regs + LPBFIFO_REG_ENABLE, 0x00000001);
if (!dma) {
/* While the FIFO can be setup for transfer sizes as large as
* 16M-1, the FIFO itself is only 512 bytes deep and it does
* not generate interrupts for FIFO full events (only transfer
* complete will raise an IRQ). Therefore when not using
* Bestcomm to drive the FIFO it needs to either be polled, or
* transfers need to constrained to the size of the fifo.
*
* This driver restricts the size of the transfer
*/
if (transfer_size > 512)
transfer_size = 512;
/* Load the FIFO with data */
if (write) {
reg = lpbfifo.regs + LPBFIFO_REG_FIFO_DATA;
data = req->data + req->pos;
for (i = 0; i < transfer_size; i += 4)
out_be32(reg, *data++);
}
/* Unmask both error and completion irqs */
out_be32(lpbfifo.regs + LPBFIFO_REG_ENABLE, 0x00000301);
} else {
/* Choose the correct direction
*
* Configure the watermarks so DMA will always complete correctly.
* It may be worth experimenting with the ALARM value to see if
* there is a performance impacit. However, if it is wrong there
* is a risk of DMA not transferring the last chunk of data
*/
if (write) {
out_be32(lpbfifo.regs + LPBFIFO_REG_FIFO_ALARM, 0x1e4);
out_8(lpbfifo.regs + LPBFIFO_REG_FIFO_CONTROL, 7);
lpbfifo.bcom_cur_task = lpbfifo.bcom_tx_task;
} else {
out_be32(lpbfifo.regs + LPBFIFO_REG_FIFO_ALARM, 0x1ff);
out_8(lpbfifo.regs + LPBFIFO_REG_FIFO_CONTROL, 0);
lpbfifo.bcom_cur_task = lpbfifo.bcom_rx_task;
if (poll_dma) {
if (lpbfifo.dma_irqs_enabled) {
disable_irq(bcom_get_task_irq(lpbfifo.bcom_rx_task));
lpbfifo.dma_irqs_enabled = 0;
}
} else {
if (!lpbfifo.dma_irqs_enabled) {
enable_irq(bcom_get_task_irq(lpbfifo.bcom_rx_task));
lpbfifo.dma_irqs_enabled = 1;
}
}
}
bd = bcom_prepare_next_buffer(lpbfifo.bcom_cur_task);
bd->status = transfer_size;
if (!write) {
/*
* In the DMA read case, the DMA doesn't complete,
* possibly due to incorrect watermarks in the ALARM
* and CONTROL regs. For now instead of trying to
* determine the right watermarks that will make this
* work, just increase the number of bytes the FIFO is
* expecting.
*
* When submitting another operation, the FIFO will get
* reset, so the condition of the FIFO waiting for a
* non-existent 4 bytes will get cleared.
*/
transfer_size += 4; /* BLECH! */
}
bd->data[0] = req->data_phys + req->pos;
bcom_submit_next_buffer(lpbfifo.bcom_cur_task, NULL);
/* error irq & master enabled bit */
bit_fields = 0x00000201;
/* Unmask irqs */
if (write && (!poll_dma))
bit_fields |= 0x00000100; /* completion irq too */
out_be32(lpbfifo.regs + LPBFIFO_REG_ENABLE, bit_fields);
}
/* Set transfer size, width, chip select and READ mode */
out_be32(lpbfifo.regs + LPBFIFO_REG_START_ADDRESS,
req->offset + req->pos);
out_be32(lpbfifo.regs + LPBFIFO_REG_PACKET_SIZE, transfer_size);
bit_fields = req->cs << 24 | 0x000008;
if (!write)
bit_fields |= 0x010000; /* read mode */
out_be32(lpbfifo.regs + LPBFIFO_REG_CONTROL, bit_fields);
/* Kick it off */
powerpc/mpc52xx_lpbfifo: optionally defer fifo transfer start Currently fifo transfer is started when submitting a transfer request. Add posibility to defer the fifo transfer and start it later by calling additional function. This change is backward compatible, the behaviour of mpc52xx_lpbfifo_submit() is the same for previous driver users, so there is no need to adapt them. Signed-off-by: Anatolij Gustschin <agust@denx.de>
2012-08-29 21:33:28 +00:00
if (!lpbfifo.req->defer_xfer_start)
out_8(lpbfifo.regs + LPBFIFO_REG_PACKET_SIZE, 0x01);
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
if (dma)
bcom_enable(lpbfifo.bcom_cur_task);
}
/**
* mpc52xx_lpbfifo_irq - IRQ handler for LPB FIFO
*
* On transmit, the dma completion irq triggers before the fifo completion
* triggers. Handle the dma completion here instead of the LPB FIFO Bestcomm
Fix common misspellings Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-30 22:57:33 -03:00
* task completion irq because everything is not really done until the LPB FIFO
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
* completion irq triggers.
*
* In other words:
* For DMA, on receive, the "Fat Lady" is the bestcom completion irq. on
* transmit, the fifo completion irq is the "Fat Lady". The opera (or in this
* case the DMA/FIFO operation) is not finished until the "Fat Lady" sings.
*
* Reasons for entering this routine:
* 1) PIO mode rx and tx completion irq
* 2) DMA interrupt mode tx completion irq
* 3) DMA polled mode tx
*
* Exit conditions:
* 1) Transfer aborted
* 2) FIFO complete without DMA; more data to do
Fix common misspellings Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-30 22:57:33 -03:00
* 3) FIFO complete without DMA; all data transferred
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
* 4) FIFO complete using DMA
*
* Condition 1 can occur regardless of whether or not DMA is used.
* It requires executing the callback to report the error and exiting
* immediately.
*
* Condition 2 requires programming the FIFO with the next block of data
*
* Condition 3 requires executing the callback to report completion
*
* Condition 4 means the same as 3, except that we also retrieve the bcom
* buffer so DMA doesn't get clogged up.
*
* To make things trickier, the spinlock must be dropped before
* executing the callback, otherwise we could end up with a deadlock
* or nested spinlock condition. The out path is non-trivial, so
* extra fiddling is done to make sure all paths lead to the same
* outbound code.
*/
static irqreturn_t mpc52xx_lpbfifo_irq(int irq, void *dev_id)
{
struct mpc52xx_lpbfifo_request *req;
u32 status = in_8(lpbfifo.regs + LPBFIFO_REG_BYTES_DONE_STATUS);
void __iomem *reg;
u32 *data;
int count, i;
int do_callback = 0;
u32 ts;
unsigned long flags;
int dma, write, poll_dma;
spin_lock_irqsave(&lpbfifo.lock, flags);
ts = get_tbl();
req = lpbfifo.req;
if (!req) {
spin_unlock_irqrestore(&lpbfifo.lock, flags);
pr_err("bogus LPBFIFO IRQ\n");
return IRQ_HANDLED;
}
dma = !(req->flags & MPC52XX_LPBFIFO_FLAG_NO_DMA);
write = req->flags & MPC52XX_LPBFIFO_FLAG_WRITE;
poll_dma = req->flags & MPC52XX_LPBFIFO_FLAG_POLL_DMA;
if (dma && !write) {
spin_unlock_irqrestore(&lpbfifo.lock, flags);
treewide: Fix typos in printk Correct spelling typo in various part of kernel Signed-off-by: Masanari Iida <standby24x7@gmail.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2013-12-09 00:22:53 +09:00
pr_err("bogus LPBFIFO IRQ (dma and not writing)\n");
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
return IRQ_HANDLED;
}
if ((status & 0x01) == 0) {
goto out;
}
/* check abort bit */
if (status & 0x10) {
out_be32(lpbfifo.regs + LPBFIFO_REG_ENABLE, 0x01010000);
do_callback = 1;
goto out;
}
/* Read result from hardware */
count = in_be32(lpbfifo.regs + LPBFIFO_REG_BYTES_DONE_STATUS);
count &= 0x00ffffff;
if (!dma && !write) {
/* copy the data out of the FIFO */
reg = lpbfifo.regs + LPBFIFO_REG_FIFO_DATA;
data = req->data + req->pos;
for (i = 0; i < count; i += 4)
*data++ = in_be32(reg);
}
/* Update transfer position and count */
req->pos += count;
/* Decide what to do next */
if (req->size - req->pos)
mpc52xx_lpbfifo_kick(req); /* more work to do */
else
do_callback = 1;
out:
/* Clear the IRQ */
out_8(lpbfifo.regs + LPBFIFO_REG_BYTES_DONE_STATUS, 0x01);
if (dma && (status & 0x11)) {
/*
* Count the DMA as complete only when the FIFO completion
* status or abort bits are set.
*
* (status & 0x01) should always be the case except sometimes
* when using polled DMA.
*
* (status & 0x10) {transfer aborted}: This case needs more
* testing.
*/
bcom_retrieve_buffer(lpbfifo.bcom_cur_task, &status, NULL);
}
req->last_byte = ((u8 *)req->data)[req->size - 1];
/* When the do_callback flag is set; it means the transfer is finished
* so set the FIFO as idle */
if (do_callback)
lpbfifo.req = NULL;
if (irq != 0) /* don't increment on polled case */
req->irq_count++;
req->irq_ticks += get_tbl() - ts;
spin_unlock_irqrestore(&lpbfifo.lock, flags);
/* Spinlock is released; it is now safe to call the callback */
if (do_callback && req->callback)
req->callback(req);
return IRQ_HANDLED;
}
/**
* mpc52xx_lpbfifo_bcom_irq - IRQ handler for LPB FIFO Bestcomm task
*
* Only used when receiving data.
*/
static irqreturn_t mpc52xx_lpbfifo_bcom_irq(int irq, void *dev_id)
{
struct mpc52xx_lpbfifo_request *req;
unsigned long flags;
u32 status;
u32 ts;
spin_lock_irqsave(&lpbfifo.lock, flags);
ts = get_tbl();
req = lpbfifo.req;
if (!req || (req->flags & MPC52XX_LPBFIFO_FLAG_NO_DMA)) {
spin_unlock_irqrestore(&lpbfifo.lock, flags);
return IRQ_HANDLED;
}
if (irq != 0) /* don't increment on polled case */
req->irq_count++;
if (!bcom_buffer_done(lpbfifo.bcom_cur_task)) {
spin_unlock_irqrestore(&lpbfifo.lock, flags);
req->buffer_not_done_cnt++;
if ((req->buffer_not_done_cnt % 1000) == 0)
pr_err("transfer stalled\n");
return IRQ_HANDLED;
}
bcom_retrieve_buffer(lpbfifo.bcom_cur_task, &status, NULL);
req->last_byte = ((u8 *)req->data)[req->size - 1];
req->pos = status & 0x00ffffff;
/* Mark the FIFO as idle */
lpbfifo.req = NULL;
/* Release the lock before calling out to the callback. */
req->irq_ticks += get_tbl() - ts;
spin_unlock_irqrestore(&lpbfifo.lock, flags);
if (req->callback)
req->callback(req);
return IRQ_HANDLED;
}
/**
* mpc52xx_lpbfifo_bcom_poll - Poll for DMA completion
*/
void mpc52xx_lpbfifo_poll(void)
{
struct mpc52xx_lpbfifo_request *req = lpbfifo.req;
int dma = !(req->flags & MPC52XX_LPBFIFO_FLAG_NO_DMA);
int write = req->flags & MPC52XX_LPBFIFO_FLAG_WRITE;
/*
* For more information, see comments on the "Fat Lady"
*/
if (dma && write)
mpc52xx_lpbfifo_irq(0, NULL);
else
mpc52xx_lpbfifo_bcom_irq(0, NULL);
}
EXPORT_SYMBOL(mpc52xx_lpbfifo_poll);
/**
* mpc52xx_lpbfifo_submit - Submit an LPB FIFO transfer request.
* @req: Pointer to request structure
*/
int mpc52xx_lpbfifo_submit(struct mpc52xx_lpbfifo_request *req)
{
unsigned long flags;
if (!lpbfifo.regs)
return -ENODEV;
spin_lock_irqsave(&lpbfifo.lock, flags);
/* If the req pointer is already set, then a transfer is in progress */
if (lpbfifo.req) {
spin_unlock_irqrestore(&lpbfifo.lock, flags);
return -EBUSY;
}
/* Setup the transfer */
lpbfifo.req = req;
req->irq_count = 0;
req->irq_ticks = 0;
req->buffer_not_done_cnt = 0;
req->pos = 0;
mpc52xx_lpbfifo_kick(req);
spin_unlock_irqrestore(&lpbfifo.lock, flags);
return 0;
}
EXPORT_SYMBOL(mpc52xx_lpbfifo_submit);
powerpc/mpc52xx_lpbfifo: optionally defer fifo transfer start Currently fifo transfer is started when submitting a transfer request. Add posibility to defer the fifo transfer and start it later by calling additional function. This change is backward compatible, the behaviour of mpc52xx_lpbfifo_submit() is the same for previous driver users, so there is no need to adapt them. Signed-off-by: Anatolij Gustschin <agust@denx.de>
2012-08-29 21:33:28 +00:00
int mpc52xx_lpbfifo_start_xfer(struct mpc52xx_lpbfifo_request *req)
{
unsigned long flags;
if (!lpbfifo.regs)
return -ENODEV;
spin_lock_irqsave(&lpbfifo.lock, flags);
/*
* If the req pointer is already set and a transfer was
* started on submit, then this transfer is in progress
*/
if (lpbfifo.req && !lpbfifo.req->defer_xfer_start) {
spin_unlock_irqrestore(&lpbfifo.lock, flags);
return -EBUSY;
}
/*
* If the req was previously submitted but not
* started, start it now
*/
if (lpbfifo.req && lpbfifo.req == req &&
lpbfifo.req->defer_xfer_start) {
out_8(lpbfifo.regs + LPBFIFO_REG_PACKET_SIZE, 0x01);
}
spin_unlock_irqrestore(&lpbfifo.lock, flags);
return 0;
}
EXPORT_SYMBOL(mpc52xx_lpbfifo_start_xfer);
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
void mpc52xx_lpbfifo_abort(struct mpc52xx_lpbfifo_request *req)
{
unsigned long flags;
spin_lock_irqsave(&lpbfifo.lock, flags);
if (lpbfifo.req == req) {
/* Put it into reset and clear the state */
bcom_gen_bd_rx_reset(lpbfifo.bcom_rx_task);
bcom_gen_bd_tx_reset(lpbfifo.bcom_tx_task);
out_be32(lpbfifo.regs + LPBFIFO_REG_ENABLE, 0x01010000);
lpbfifo.req = NULL;
}
spin_unlock_irqrestore(&lpbfifo.lock, flags);
}
EXPORT_SYMBOL(mpc52xx_lpbfifo_abort);
POWERPC: drivers: remove __dev* attributes. CONFIG_HOTPLUG is going away as an option. As a result, the __dev* markings need to be removed. This change removes the use of __devinit, __devexit_p, __devinitdata, __devinitconst, and __devexit from these drivers. Based on patches originally written by Bill Pemberton, but redone by me in order to handle some of the coding style issues better, by hand. Cc: Bill Pemberton <wfp5p@virginia.edu> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-12-21 14:04:10 -08:00
static int mpc52xx_lpbfifo_probe(struct platform_device *op)
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
{
struct resource res;
int rc = -ENOMEM;
if (lpbfifo.dev != NULL)
return -ENOSPC;
of: Always use 'struct device.of_node' to get device node pointer. The following structure elements duplicate the information in 'struct device.of_node' and so are being eliminated. This patch makes all readers of these elements use device.of_node instead. (struct of_device *)->node (struct dev_archdata *)->prom_node (sparc) (struct dev_archdata *)->of_node (powerpc & microblaze) Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-04-13 16:12:29 -07:00
lpbfifo.irq = irq_of_parse_and_map(op->dev.of_node, 0);
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
if (!lpbfifo.irq)
return -ENODEV;
of: Always use 'struct device.of_node' to get device node pointer. The following structure elements duplicate the information in 'struct device.of_node' and so are being eliminated. This patch makes all readers of these elements use device.of_node instead. (struct of_device *)->node (struct dev_archdata *)->prom_node (sparc) (struct dev_archdata *)->of_node (powerpc & microblaze) Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-04-13 16:12:29 -07:00
if (of_address_to_resource(op->dev.of_node, 0, &res))
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
return -ENODEV;
lpbfifo.regs_phys = res.start;
of: Always use 'struct device.of_node' to get device node pointer. The following structure elements duplicate the information in 'struct device.of_node' and so are being eliminated. This patch makes all readers of these elements use device.of_node instead. (struct of_device *)->node (struct dev_archdata *)->prom_node (sparc) (struct dev_archdata *)->of_node (powerpc & microblaze) Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-04-13 16:12:29 -07:00
lpbfifo.regs = of_iomap(op->dev.of_node, 0);
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
if (!lpbfifo.regs)
return -ENOMEM;
spin_lock_init(&lpbfifo.lock);
/* Put FIFO into reset */
out_be32(lpbfifo.regs + LPBFIFO_REG_ENABLE, 0x01010000);
/* Register the interrupt handler */
rc = request_irq(lpbfifo.irq, mpc52xx_lpbfifo_irq, 0,
"mpc52xx-lpbfifo", &lpbfifo);
if (rc)
goto err_irq;
/* Request the Bestcomm receive (fifo --> memory) task and IRQ */
lpbfifo.bcom_rx_task =
bcom_gen_bd_rx_init(2, res.start + LPBFIFO_REG_FIFO_DATA,
BCOM_INITIATOR_SCLPC, BCOM_IPR_SCLPC,
16*1024*1024);
if (!lpbfifo.bcom_rx_task)
goto err_bcom_rx;
rc = request_irq(bcom_get_task_irq(lpbfifo.bcom_rx_task),
mpc52xx_lpbfifo_bcom_irq, 0,
"mpc52xx-lpbfifo-rx", &lpbfifo);
if (rc)
goto err_bcom_rx_irq;
powerpc/5200: in lpbfifo, flag DMA irqs as enabled after requesting them This patch avoids unbalanced enable/disable messages for the DMA interrupts when running the 5200 platform SCLPC/BestComm driver in DMA mode. Signed-off-by: Roman Fietze <roman.fietze@telemotive.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-03-26 22:09:57 -06:00
lpbfifo.dma_irqs_enabled = 1;
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
/* Request the Bestcomm transmit (memory --> fifo) task and IRQ */
lpbfifo.bcom_tx_task =
bcom_gen_bd_tx_init(2, res.start + LPBFIFO_REG_FIFO_DATA,
BCOM_INITIATOR_SCLPC, BCOM_IPR_SCLPC);
if (!lpbfifo.bcom_tx_task)
goto err_bcom_tx;
lpbfifo.dev = &op->dev;
return 0;
err_bcom_tx:
free_irq(bcom_get_task_irq(lpbfifo.bcom_rx_task), &lpbfifo);
err_bcom_rx_irq:
bcom_gen_bd_rx_release(lpbfifo.bcom_rx_task);
err_bcom_rx:
err_irq:
iounmap(lpbfifo.regs);
lpbfifo.regs = NULL;
dev_err(&op->dev, "mpc52xx_lpbfifo_probe() failed\n");
return -ENODEV;
}
POWERPC: drivers: remove __dev* attributes. CONFIG_HOTPLUG is going away as an option. As a result, the __dev* markings need to be removed. This change removes the use of __devinit, __devexit_p, __devinitdata, __devinitconst, and __devexit from these drivers. Based on patches originally written by Bill Pemberton, but redone by me in order to handle some of the coding style issues better, by hand. Cc: Bill Pemberton <wfp5p@virginia.edu> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-12-21 14:04:10 -08:00
static int mpc52xx_lpbfifo_remove(struct platform_device *op)
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
{
if (lpbfifo.dev != &op->dev)
return 0;
/* Put FIFO in reset */
out_be32(lpbfifo.regs + LPBFIFO_REG_ENABLE, 0x01010000);
/* Release the bestcomm transmit task */
free_irq(bcom_get_task_irq(lpbfifo.bcom_tx_task), &lpbfifo);
bcom_gen_bd_tx_release(lpbfifo.bcom_tx_task);
/* Release the bestcomm receive task */
free_irq(bcom_get_task_irq(lpbfifo.bcom_rx_task), &lpbfifo);
bcom_gen_bd_rx_release(lpbfifo.bcom_rx_task);
free_irq(lpbfifo.irq, &lpbfifo);
iounmap(lpbfifo.regs);
lpbfifo.regs = NULL;
lpbfifo.dev = NULL;
return 0;
}
powerpc: make of_device_ids const of_device_ids (i.e. compatible strings and the respective data) are not supposed to change at runtime. All functions working with of_device_ids provided by <linux/of.h> work with const of_device_ids. This allows to mark all struct of_device_id const, too. While touching these line also put the __init annotation at the right position where necessary. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2014-09-10 21:56:38 +02:00
static const struct of_device_id mpc52xx_lpbfifo_match[] = {
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
{ .compatible = "fsl,mpc5200-lpbfifo", },
{},
};
powerpc: platforms: mpc52xx_lpbfifo: Fix module autoload for OF platform driver This platform driver has a OF device ID table but the OF module alias information is not created so module autoloading won't work. Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2015-10-20 16:04:12 +01:00
MODULE_DEVICE_TABLE(of, mpc52xx_lpbfifo_match);
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
dt/powerpc: Eliminate users of of_platform_{,un}register_driver Get rid of old users of of_platform_driver in arch/powerpc. Most of_platform_driver users can be converted to use the platform_bus directly. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-02-22 19:59:54 -07:00
static struct platform_driver mpc52xx_lpbfifo_driver = {
of: Remove duplicate fields from of_platform_driver .name, .match_table and .owner are duplicated in both of_platform_driver and device_driver. This patch is a removes the extra copies from struct of_platform_driver and converts all users to the device_driver members. This patch is a pretty mechanical change. The usage model doesn't change and if any drivers have been missed, or if anything has been fixed up incorrectly, then it will fail with a compile time error, and the fixup will be trivial. This patch looks big and scary because it touches so many files, but it should be pretty safe. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Sean MacLennan <smaclennan@pikatech.com>
2010-04-13 16:13:02 -07:00
.driver = {
.name = "mpc52xx-lpbfifo",
.of_match_table = mpc52xx_lpbfifo_match,
},
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
.probe = mpc52xx_lpbfifo_probe,
POWERPC: drivers: remove __dev* attributes. CONFIG_HOTPLUG is going away as an option. As a result, the __dev* markings need to be removed. This change removes the use of __devinit, __devexit_p, __devinitdata, __devinitconst, and __devexit from these drivers. Based on patches originally written by Bill Pemberton, but redone by me in order to handle some of the coding style issues better, by hand. Cc: Bill Pemberton <wfp5p@virginia.edu> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-12-21 14:04:10 -08:00
.remove = mpc52xx_lpbfifo_remove,
powerpc/5200: add LocalPlus bus FIFO device driver This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system. The driver supports programmed I/O through the FIFO as well as setting up DMA via the BestComm engine through the FIFO. Signed-off-by: John Bonesio <bones@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2009-09-29 10:43:42 +00:00
};
powerpc/mpc52xx: use module_platform_driver macro This patch removes some code duplication by using module_platform_driver. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com> Signed-off-by: Anatolij Gustschin <agust@denx.de>
2012-10-10 08:32:24 +00:00
module_platform_driver(mpc52xx_lpbfifo_driver);
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